DSP56367 datasheet(14/100 Pages) FREESCALE

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Parallel Host Interface (HDI08)

DSP56367 Technical Data, Rev. 2.1

2-10

Freescale Semiconductor

HCS

HA10

PB13

Input

Input, Output, or

Disconnected

GPIO

Disconnected

Host Chip Select—When HDI08 is programmed to interface a

nonmultiplexed host bus and the HI function is selected, this signal is the host

chip select (HCS) input. The polarity of the chip select is programmable, but

is configured active-low (HCS) after reset.

Host Address 10—When HDI08 is programmed to interface a multiplexed

host bus and the HI function is selected, this signal is line 10 of the host

address (HA10) input bus.

Port B 13—When the HDI08 is configured as GPIO, this signal is individually

programmed as input, output, or internally disconnected.

The default state after reset for this signal is GPIO disconnected.

This input is 3.3V tolerant.

HOREQ/

HOREQ

HTRQ/

HTRQ

PB14

Output

Input, Output, or

Disconnected

GPIO

Disconnected

Host Request—When HDI08 is programmed to interface a single host

request host bus and the HI function is selected, this signal is the host request

(HOREQ) output. The polarity of the host request is programmable, but is

configured as active-low (HOREQ) following reset. The host request may be

programmed as a driven or open-drain output.

Transmit Host Request—When HDI08 is programmed to interface a double

host request host bus and the HI function is selected, this signal is the transmit

host request (HTRQ) output. The polarity of the host request is

programmable, but is configured as active-low (HTRQ) following reset. The

host request may be programmed as a driven or open-drain output.

Port B 14—When the HDI08 is configured as GPIO, this signal is individually

programmed as input, output, or internally disconnected.

The default state after reset for this signal is GPIO disconnected.

This input is 3.3V tolerant.

HACK/

HACK

HRRQ/

HRRQ

PB15

Input

Output

Input, Output, or

Disconnected

GPIO

Disconnected

Host Acknowledge—When HDI08 is programmed to interface a single host

request host bus and the HI function is selected, this signal is the host

acknowledge (HACK) Schmitt-trigger input. The polarity of the host

acknowledge is programmable, but is configured as active-low (HACK) after

reset.

Receive Host Request—When HDI08 is programmed to interface a double

host request host bus and the HI function is selected, this signal is the receive

host request (HRRQ) output. The polarity of the host request is

programmable, but is configured as active-low (HRRQ) after reset. The host

request may be programmed as a driven or open-drain output.

Port B 15—When the HDI08 is configured as GPIO, this signal is individually

programmed as input, output, or internally disconnected.

The default state after reset for this signal is GPIO disconnected.

This input is 3.3V tolerant.

Table 2-9 Host Interface (continued)

Signal Name

Type

State During

Reset

Signal Description

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